mq_close()

Close a message queue

Synopsis:

#include <mqueue.h>

int mq_close( mqd_t mqdes );

Arguments:

mqdes

The message-queue descriptor, returned by mq_open(), of the message queue that you want to close.

Library:

• For the traditional implementation, libc

  Use the -l c option to qcc to link against this library. This library is usually included automatically.

• For the alternate implementation using asynchronous messages, libmq

  Use the -l mq option to qcc to link against this library.

Description:

The mq_close() function removes the association between mqdes and a message queue. If the current process attaches a notify to this queue for notification, the attachment is eliminated. If this queue is unlinked before the call to mq_close(), and this process is the last process to call mq_close() on the queue, then the queue is destroyed, along with its contents.

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Neutrino supports two implementations of message queues: a traditional implementation, and an alternate one that uses asynchronous messages. For more information, see the entries for mq and mqueue in the Utilities Reference, as well as the Managing POSIX Message Queues technote.

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In the traditional (mqueue) implementation, calling close() with mqdes has the same effect as calling mq_close().

Returns:

-1 if an error occurred (errno is set). Any other value indicates success.

Errors:

EBADF

Invalid queue mqdes.

Classification:

POSIX 1003.1 MSG

See also:

mq_open(), mq_unlink()

mq, mqueue in the Utilities Reference

Managing POSIX Message Queues technote.